chapter 11.
https://www.gutenberg.org/ebooks/25717_
ALEMANNI: A. D. 355-361. Repulse by Julian.
See GAUL: A. D. 355-361.
ALEMANNI: A. D. 365-367. Invasion of Gaul.
The Alemanni invaded Gaul in 365, committing widespread ravages and carrying away into the forests of Germany great spoil and many captives. The next winter they crossed the Rhine, again, in still greater numbers, defeated the Roman forces and captured the standards of the Herulian and Batavian auxiliaries. But Valentinian was now Emperor, and he adopted energetic measures. His lieutenant Jovinus overcame the invaders in a great battle fought near Chalons and drove them back to their own side of the river boundary. Two years later, the Emperor, himself, passed the Rhine and inflicted a memorable chastisement on the Alemanni. At the same time he strengthened the frontier defences, and, by diplomatic arts, fomented quarrels between the Alemanni and their neighbors, the Burgundians, which weakened both.
_E. Gibbon, Decline and Fall of the Roman Empire,